Personally I have no intention of using paid features on Nostr myself, but moderation at the level of individual communities is different than moderation at the relay level. Communities on Nostr are like subreddits. There is value in having the ability to create forums which aren't censored by platform owners (but can be moderated by the owners of that forum). They can have any set of rules to follow, be about any topic and require any kind of format or post.